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Debt Issuance (Notes)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Debt Issuance Debt Issuance
On May 3, 2019, the Corporation issued $500 million of 3.15% senior notes, due May 3, 2029. The senior notes will bear interest from the date they were issued at an annual rate of 3.15%, payable semi-annually in arrears. The senior notes are unsecured and may be redeemed, in whole or in part, on or after February 3, 2029, at a redemption price equal to 100% of the principal amount of the senior notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.